New Year's Eve celebrations occur sequentially in your listed cities, starting with Reykjavik (Iceland) and Accra (Ghana) first due to their eastern longitudes, followed by London, Dublin, and Lisbon, with Casablanca (Morocco) also celebrating around the same time, generally kicking off at midnight local time as the day transitions to January 1st. These locations experience New Year's Eve at different hours, moving westwards across time zones, with celebrations featuring local traditions, fireworks, and parties.